How do I defeat this campaign on Legendary? I'm a UD player trying to get the blood owl reward but this campaign feels impossible.
You need to make a deck specifically for the campaign, have decent luck, and patience. 1 deck size does not fit all, although I'm -general- the safest tactic is to stall, then use runes that gain value over time.
There's a thread on it in the Training Grounds. Here's a link. http://forums.poxnora.com/index.php?threads/boons-eve-campaign-on-legendary.19629/
